Carbureter.



R. SYMMONUS, JB.

GARBURETER.

APPLIOATIONJILED we. 2, 1906.

1,013,082, Patented Dec. 26, 1911.

2 SHEETSSHEET 1.

11. SYMMONDS, J11.

GARBUBETER.

APIPLIOATION FILED AUG. 2, 1906.

Patented Dec.26,1911.

2 BHEBTS-SHEET 2.

l'okzi/y mmim Jr 1 fawn/Z277 v coLUIAIIA PLANOGIAPII 30., WASHINGTON, n.c.

UNITED STATES PATENT orrion.

ROBERT SYMMONDS, J R., OF KENOSI-IA, WISCONSIN, A SSIGNOZR. T O THOMASB. JEFFERY,

OF KENOSHA, WISCONSIN.

CARBURETER.

Specification of Letters Patent.

Patented Dec. 26, 1911.

Application filed August 2; 1906. Serial No. 328,871.

at Kenosha, county of Kenosha, State of Wisconsin, have invented acertain new and useful Improvements 1n Garbureters, and declare thefollowlng to be a full, clear, and

, exact description of the same, such as will enable others skilled inthe art to which it pertains to make and use the same, reference beinghad to the accompanying drawings, which form a part of thisspecification.

My invention relates in general to carbureters and more particularly toa carbureter especially adapted for supplying a combustible mixture toan explosive engine on an automobile.

The volume of mixed air and hydro-carbon vapor delivered to an enginemust, of course, increase as the speed of the engine increases, and inorder that the volume of air supplied to the mixture may increase it isdesirable that the ports or passages through which the air is suppliedto be mixed with the vaporized hydro-carbon should be automaticallyincreased in ca pacity as the speed of the .engine increases.Carbureters as heretofore constructed have comprised a primary mixingchamber in which air is mixed with the vaporized hydro-carbon, and asupplemental mixing chamber where the mixture formed in the primarychamber is supplied with additional air. In order to obtain the bestresults and reduce to a minimum the consumption of the hydro-carbon, itis desirable that the air supplied to the auxiliary mixing chambershould be automatically increased in volume as the speed of the engineincreases.

The primary object of my invention isto provide a carbureter in whichthe volume of air supplied to the combustible mixture will beautomatically and definitely increased in volume according to theincreased" speed of the engine.

A further object of my invention is to provide a carburetor which may becon structed of light, thin metal, and which will be inexpensive inmanufacture and eflicient.

in operation. y a

The embodiment of my invention herein disclosed may begenerally-described as comprising a primary mixingchamber in which airis mixed with vaporized hydro-carbon, a secondary mixing chamber towhich the mix- 7 ture passes from the primary chamber and to whichadditional air is supplied, and means for automatically varying thevolume of air supplied to the secondary mixing chamber as the speed ofthe engine varies.

My invention will be more fully described hereinafter with reference tothe accompanying drawings in which the same is illustrated as embodiedin a convenient and practical form, and in which Figure 1 is a verticalsectional view on line 1-1 Fig. 3; Fig. 2 a vertical sectional view online 2-2 Fig. 3; Fig. 3 a horizontal sectional view on line 33 Fig. 1;Fig. 4 a horizontal sectional view on line 4.4 Fig. 1; and Fig; 5 a viewsimilar to Fig. 3 showing on a smaller scale a modification.

Similar reference characters are used to designate similar parts in theseveral figures of the drawings.

Reference character A indicates a casing which may conveniently bepressed from sheet metal.

B designates a cover for the casing A which may conveniently be formedintegrally with the conduit 6 leading to the en-.

1 gine. The cover B may also be conveniently formed of pressed sheetmetal and is provided with a screw-thread around its lower end engaginga screwthread Within the upper end of the casing A. l

C designates a tube extending upwardly supplied. The tube C may beconveniently retained within the casing A by a flange a on the lowerwall of the casing closely surrounding the tube.

D designates a plate located Within the casing A at the upper end of thetube C. The plate Dis provided with a circular flange cl extendingwithin and secured to the upper end of the tube C. A circular flange 03projects upwardly around the outer edge of the plate D and closelyengages the inner surface of the casing A.

E designates a partition, the periphery of which is secured between theupper edge of the flange d and the lower edge of the cover B ofthecasing. The partition E is providedwith a plurality of openings therethrough controlled by valves. For convenience three openings areshown'which are opened or closed by the valves E, E and E Each of thevalves is provided with a flange adapted to overlie the surface withinthe casing A through which air is of the partition around the openingcontrolled thereby, and is also provided with a central opening aroundwhich project circular flanges forming guides through which 5 extends. arod F. TherodFis provided with a screw-threaded portion extendingthrough an interiorly screw-threaded collar f secured within the coverB. The end of the rod F outside of the cover B is preferably milled tofacilitate its rotation. Surrounding the rod F immediately below thecollar f is'a washer f intermediate of which and the valve is a spring,the tension of which retains the valve seated to close the correspondingopening through the partition E. 6, 6 and e designate the springs forseating the respective valves E, E and E These springs may be, asindicated in the drawings, of graduated size or they may be of the samesize and of different tension by reason of diflerent adjustments of theseveral rods F H designates a needle valve extending within, and inscrew-threaded engagement with a sleeve Gr depending from, and formedintegrally with a short tube Gr communicating through the tube C withthe interior of the casing A. The tube G may be conveniently supportedat one end by a reduced portion thereon extending within an opening inthe tube C while a supporting pin 9 is provided for supporting theopposite side of the sleeve G, such pin engaging at one end a socket inthe sleeve and extending at its other end through an opening in the tubeC. H designates a nozzle surrounding the needle valve and supported atits lower end within the upper end of the sleeve Gr. An opening it isprovided in the upper end of the nozzle H, which is controlled by thetapered end it of the needle-valve. Surrounding the upper end of thenozzle is a tube H constituting the primary mixing chamber which may beconveniently supported within a circular flange 6 formed on thepartition E.

K indicates an annular float within the chamber A and surrounding theinlet tube G. L indicates a lever pivoted upon a rod Z and bifurcated tosurround the tube C and underlie the float K at diametrically oppositepoints. The opposite end Z of the lever L is also bifurcated andunderlies a weight m fixed upon the gravity needle valve M whichcontrols the supply of gasolene, or other hydro-carbon to the interiorof the casing A. The needle valve M is located within a casing N thelower end of which is provided with a passage 01. con trolled by theneedle valve W. The lower end of the casing N is adapted to communicatewith a conduit leading from a supply of gasolene. The portion m of theneedle valve above the weight on thereon extends 6 loosely through anopening in a nut N closing the upper end of the valve casing N. Thevalve casing N may be secured to the exterior of the casing A in anysuitable manner, as for instance by means of a reduced portion a thereonextending within an opening in the wall of the casing A. Brackets n mayalso be provided on the valve casing N to engage the outer surfaces ofthe casing A to prevent the movement of the valve casing relativelythereto.

0 indicates a throttle valve located in the tube 7) which leads to theengine. This throttle valve may conveniently be of the butter-fly typeand is rigidly secured to a rod P extending through, and rotat-ablysupported by the tube 6.

0 designates a clamp screw for locking the valve to the rod P while pdesignates an arm fixed to the rod P for oscillating the latter, andthereby opening and closing the throttle valve.

The operation of my improved carbureter is as follows: Gasolene or otherhydro-carbon is supplied through the port n in the valve casing N to thefloat chamber formed by the portion of the casing A below the plate Dand surrounding the tube C. WVhen the predetermined amount of the fluidhas accumulated in the float chamber the float K rises therebypermitting the weight of the needle valve to force the same against itsseat and discontinue the further flow of fluid to the float chamber.When the fluid in the float chamber falls below the predetermined levelthe flow descends and through engagement with the bifurcated ends of thelever=L oscillates the same about its fulcrum thereby lifting theneedle-valve M away from its seat and permitting the fluid to be againsupplied to the float chamber. The action of the engine with which thecarbureter communicates through the tube 7), creates a suction whichdraws the gasolene through the nozzle H past the point it of the needlevalve. The suction of the engine also draws air through the tube C andupwardly around the nozzle H sothat an explosive mixture of air andcombustible fluid is formed in the tube H which constitutes a primarymixing chamber. 1-15 \Vhen the speed of the engine increases the suctionis such that one of the valves on I the partition E is un-seated againstthe tension of its closing spring thereby admitting air into theauxiliary mixing chamber formed by the space between the partition E andtop of the cover B where it is com bined with the mixture flowingthereto from the primary mixing chamber H When the speed of theenginestill further increases a second valve on the partition E isun-seated thereby permitting an additional volume of air to pass to theauxiliary mixing chamber.

A still higherspeed of the engine unseats the third valve and permits astill greater quantity of air to pass to the auxiliary mixing chamber.The needle valve H is first adjusted so that the proper amount of the'gine has been attained.

combustible fluid will pass through the nozzle H to the primary mixingchamber. The several valves on the partition E are then separatelyadjusted so that the first will open when the engine has attained such aspeed that an additional volume of air should be added to the mixture.The other valves are then adjusted so that they will successively openthereby increasing the volume of air supplied to the combustible mixtureas the speed of the engine increases. The valves on the partition E maybe made to successively open by adjusting the rods F thereby varying thetensions of the springs which hold the valve seated. The valves arethereby made to successively open the suction above the same isincreased by the increased speed of the engine. If desired the valvesmay be held to their seats by different pressures by making the springsdifferent sizes as shown in the drawings. The valves on the partition Emay also be made to successively open by varying their size as shown inFig. 5 in which the largest valve E will open first, and as the speed ofthe engine increases the next largest valve E while the smallest valve Ewill only open when the maximum speed of the enlVhen the valves are ofdifferent sizes it is not necessary to adjust the tensions of thesprings which seat the valves.

From the foregoing description it will be observed that I have inventedan improved carburetor in which the volume of air supplied to thecombustible mixture will be definitely and automatically increased asthe speed of the engine increases, thereby securing the mostadvantageous result with a minimum consumption of the gasolene or,otherhydro-carbon.

Having now fully describedmy invention, what I claim as new and desireto secure by Letters Patent is:

1. In a carbureter for explosive engines, the combination with a primarymixing chamber having an inlet port for a combustible fluid and anoutlet port for a combustible mixture, of means for supplying air tosaid mixing chamber, an auxiliary mixing chamber with which the primarymixing chamber communicates, a plurality of valves controlling air portsleading to said auxiliary mixing chamber, and springs of differenttensions for retaining said valves seated, whereby said valves willsuccessively open as the speed of the engine increases.

2. Ina carbureter for explosive engines, the combination with a primarymixing chamber having an inlet port for a combustible fluid and anoutlet port for a combustible mixture, of means for supplying air tosaid mixing chamber, an auxiliary mixing chamber with which the primarymixing chamber communicates, a plurality of valves controlling air portsleading to said auxiliary mixing chamber, springs for normally seatingsaid valves, and means for adjusting the tensions of said springswhereby they will successively open the speed of the engine increases.

3. In a carbureter, the combination with a casing, an air supply tubeextending concentrically within said casing, a plate supported at theupper end of said tube and forming the top of a combustible fluidchamber, a partition supported within said casing above said plate,.atube extending through and depending from said partition, a nozzlecommunicating with said fluidsupply chamber and extending within said.last mentioned tube, a plurality of valves controlling air-supply portsin said partition. and means for controlling the snaressive opening ofsaid valves as the speed of the engine increases.

4. In a carbureter, the combination with a casing containing a floatchamber to which a combustible fluid is supplied, a float in saidchamber for controlling the supply of fluid thereto, a nozzlecommunieating with said chamber, an air inlet tube surrounding saidnozzle and extending Within said casing, a partition within said casing,a tube depending from said partition and surrounding said nozzle, aplurality of valves controlling ports through said partition, and meansfor permitting said valves to open successively as the speed of theengine increases.

5. In a carbureter, the combination, with a supply reservoir and adischarge nozzle leading therefrom, of a main air supply conduit withinwhich the nozzle is mounted, and a supplemental air conduit, saidsupplemental air conduit being provided with a pair of inlets, a pair ofindependent valves one for each of said inlets, and independent meansfor yieldingly holding said valves in normal position at difierenttensions. j

6. .In a carbureter, the combination, with a supply reservoir and adischarge nozzle into the main conduit beyond the fuel noz zle, saidsupplemental air conduit being provided with a pair of inlets, a pair ofindependent valves one for each of said inlets, and independentadjustable means for yieldingly holding said valves in normal positionat different tensions.

In testimony whereof, I sign this specifi cation in the presence of twowitnesses.

ROBERT SYLlMONDS, JR. Witnesses:

J. W. DE CoU,

CHARLES T. ABBOTT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

